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Processes for the synthesis of rocuronium bromide

a technology of rocuronium bromide and synthesis process, which is applied in the direction of steroids, muscular disorders, neuromuscular disorders, etc., can solve the problems of increasing production costs, reducing yield, and increasing manufacturing tim

Inactive Publication Date: 2009-04-09
MENDEZ JUANA ARACELI +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each purification step reduces yield, increases the cost of production, and increases manufacturing time.

Method used

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  • Processes for the synthesis of rocuronium bromide
  • Processes for the synthesis of rocuronium bromide
  • Processes for the synthesis of rocuronium bromide

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of the mixture of 2α,3α-epoxy-16β-(1-pyrrolidinyl)-5α-androstan-17-one, Compound VI, and 2α,3α-epoxy-16α-(1-pyrrolidinyl-5α-androstan-17-one, Compound VI-a

[0120]To a solution of 2α,3α,16α,17α-bisepoxy-5α-androstan-17β-ol acetate III (50 g, 144.32 mmol) in methanol (500 mL) was added a 4 N solution of sodium hydroxide (40 mL, 9.525, 158.75 mmol) at 20-24° C. and under nitrogen atmosphere. The mixture was heated to reflux (60-65° C.) for 30 min, followed by cooling to 40° C. and addition of pyrrolidine (24 mL, 288.64 mmol). The reaction mixture was heated to reflux (60-65° C.) for 30-45 min, followed by cooling to room temperature and then ice-water (500 mL) was added, to obtain a suspension. The suspension was stirred at 5° C. for 30 min and then the solid was filtered off and washed with cold water (2×200 mL). The wet solid was dried under vacuum to give 47 g of Compound VI as a pale yellow powder having a ratio of VI-a to VI of 18:82.

example 2

Equilibration process to obtain 2α,3α-epoxy-16β-(1-pyrrolidinyl)-5α-androstan-17-one, Compound VI

[0121]The dried compound of Example 1 (47 g) was suspended in methanol (235 mL) and refluxed (60-65° C.) between 20-30 min. Water was added (715 mL) over a period of 20 min. and the resulting mixture was heated at 65-70° C. during 30 min. The formed suspension was cooled at 0-5° C. in a period of 30-40 min and the suspension was further stirred at this temperature for 20 min. The suspension was filtered and washed with water (188 mL). The wet solid was dried under vacuum to give 43 g (120.26 mmol, 83% yield, purity of 93% by HPLC, having a melting point of 146° C.) of Compound VI as a white solid, having a ratio of VI-a to VI of 1.8:98.2. [α]D20+101.1 (c=1.0 in CHCl3).

example 3

Preparation of 2α,3α-epoxy-16β-(1-pyrrolidinyl)-5α-androstan-17β-ol, Compound IV

[0122]A suspension of 1 g (2.8 mmol) of Compound VI in of methanol (20 mL) was cooled to −10° C., and then sodium borohydride (200 mg, 5.04 mmol) was added carefully in portions, under a nitrogen atmosphere. The resulting heterogeneous reaction mixture was allowed to reach 20-24° C. and stirred for at least 3 h. The reaction mixture was diluted with CH2Cl2 and then purified water was added at 20-22° C. The solution was stirred for 10 min. and then the phases were separated. The organic phase was washed with purified water and the solution was concentrated under vacuum to give the desired crude Compound IV. The product was dried in a vacuum oven at 40° C. for at least 16 h to give 1 g (0.00278 mole) of a white solid (99.3% yield) containing the product IV 98.5% and the isomer IV-a 1.1% area by HPLC. M.P. 171° C.; [α]D20+34.0 (c=1.0 in CHCl3). The structure was confirmed by spectroscopic analysis.

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Abstract

The invention encompasses processes for synthesizing 1-[17β-acetyloxy-3α-hydroxy-2β-(4-morpholinyl)-5α-androstan-16β-yl]-1-(2-propenyl)pyrrolidinium bromide (rocuronium bromide) and intermediates thereof.

Description

RELATED APPLICATIONS[0001]This application is a divisional of U.S. application Ser. No. 11 / 521,282, filed Sep. 13, 2006, and claims the benefit of U.S. provisional application Ser. Nos. 60 / 717,122, filed on Sep. 13, 2005; 60 / 752,671, filed on Dec. 19, 2005; 60 / 752,435, filed on Dec. 20, 2005; 60 / 776,322, filed on Feb. 23, 2006; and 60 / 784,746, filed on Mar. 21, 2006, herein incorporated by reference.FIELD OF THE INVENTION[0002]The invention encompasses processes for synthesizing 1-[17β-acetyloxy-3α-hydroxy-2β-(4-morpholinyl)-5α-androstan-16β-yl]-1-(2-propenyl)pyrrolidinium bromide (rocuronium bromide) and intermediates thereof.BACKGROUND OF THE INVENTION[0003]1-[17β-(acetyloxy)-3α-hydroxy-2β-(4-morpholinyl)-5α-androstan-16β-yl]-1-(2-propenyl)pyrrolidinium bromide (rocuronium bromide) of formula I, has the following structure:with a formula of C32H53BrN2O4 and a molecular weight of 609.70. Rocuronium bromide is used as a nondepolarizing neuromuscular blocking agent with a rapid to in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07D413/08
CPCC07J43/003C07J43/00A61P21/02A61P25/00A61P43/00C07D451/10
Inventor MENDEZ, JUANA ARACELIDE LA MORA, MARCO A.RODRIGUEZ, ANGEL A.BARRAGAN, EFRAINHERRERA, HUGOGUILLEN, ALEJANDRO
Owner MENDEZ JUANA ARACELI
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