The acidity difference of the amide rotamers has been revised for a large set ofN-acetyl amino acids.
酰胺构象异构体的酸度差异已经针对大量的N-乙酰氨基酸进行了修订。
[EN] PREPARATION OF MAYTANSINOID ESTERS<br/>[FR] PRÉPARATION D'ESTERS DE MAYTANSINOÏDE
申请人:BIO THERA SOLUTIONS LTD
公开号:WO2014094354A1
公开(公告)日:2014-06-26
Provided are efficient methods for direct coupling of a maytansinoid with a carboxylic acid to prepare a maytansinoid C-3 ester in high yield using a rare earth metal-based or trifluoromethanesulfonate-based Lewis acid catalyst and a base together with a coupling reagent. Also provided are compositions used in such methods.
Synthesis of <i>N</i>-Methylamino Acid Derivatives from Amino Acid Derivatives using Sodium Hydride/Methyl Iodide
作者:John R. Coggins、N. Leo Benoiton
DOI:10.1139/v71-317
日期:1971.6.1
N-acetyl-, N-benzoyl-, and N-carbobenzoxy derivatives of aliphatic amino acids with sodium hydride/methyliodide in tetrahydrofuran containing dimethylformamide at 80° gave the corresponding N-methylamino acid methyl esters as oils in high yields. Saponification of these gave the N-protected-N-methylamino acids, and decarbobenzoxylation gave the N-methylamino acid methyl ester hydrobomides. The products are
4, 5-Deoxymaytansinoids, e.g., 4, 5-deoxyansamitocin P-3 (VI) and 4, 5-deoxymaytansine (VII), were synthesized a) by conversion of maytansinol into 4, 5-deoxymaytansinol (V), followed by acylation using active esters of appropriate carboxylic acids, and b) by direct deoxygenation of the parent maytansinoids. Chromatographic and spectral analyses proved that conformational isomerism exists among these 4, 5-deoxymaytansinoids. Compounds VI and VII showed biological activities characteristic of maytansine ; thus, the epoxide function in maytansinoids is not essential for their biological properties.
[EN] CRF RECEPTOR ANTAGONISTS AND METHODS OF USE<br/>[FR] ANTAGONISTES DU RÉCEPTEUR CRF ET MÉTHODES D'UTILISATION
申请人:NEUROCRINE BIOSCIENCES INC
公开号:WO2021062246A1
公开(公告)日:2021-04-01
Compounds are provided herein, as well as related preparations, compositions and methods for treating diseases and/or disorders that would benefit from the same such as congenital adrenal hyperplasia (CAH).