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653 results about "Methylamide" patented technology

In chemistry, an N-methylamide (NME) is a blocking group for the C-terminus end of peptides. When the carboxyl group of the C-terminus is replaced with a methylamide, further elongation of the peptide chain is prevented. C-Terminal modified peptides are also useful for the modulation of structure-activity relationships and for modifying conformational properties of peptides. N-Methylamides can be prepared directly from solid phase resin-bound peptides.

2-aryl quinazoline or 2-heterocyclic aryl quinazoline derivative and preparation method thereof

The invention discloses a 2-aryl quinazoline or 2-heterocyclic aryl quinazoline derivative and a preparation method thereof. The structural formula of the product is shown in a formula (i), wherein Ar represents aryl, substituted aryl, heterocyclic aryl or substituted heterocyclic aryl. The preparation method of the 2-aryl quinazoline or 2-heterocyclic aryl quinazoline derivative comprises the following steps of: reacting aromatic formaldehyde or heterocyclic aromatic formaldehyde with ortho-amino toluamide at high temperature to obtain a 2-aryl quinazoline-4(3H)-ketone derivative or a 2-heterocyclic aryl quinazoline-4(3H)-ketone derivative; subsequently reducing the 2-aryl quinazoline-4(3H)-ketone derivative or the 2-heterocyclic aryl quinazoline-4(3H)-ketone derivative into a 2-aryl-3,4-dihydro quinazoline derivative or a 2-heterocyclic aryl-3,4-dihydro quinazoline derivative by using an appropriate reducing agent; and finally synthesizing the 2-aryl quinazoline or 2-heterocyclic aryl quinazoline derivative by using an oxidizing agent in an oxidation mode. Compared with the conventional synthesis method, the preparation method has the advantages of easy and available raw material, simple synthesis method, temperate reaction condition, high yield and the like, is easy to purify, and is a synthesis method applicable to industrial production.
Owner:NANJING UNIV OF POSTS & TELECOMM
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