The present invention relates to new CGRP-antagonists of general formula I
wherein R
1
, R
2
, R
3
, R
a
, R
b
, R
c
, X, Y and Z are defined as mentioned hereinafter, the individual diastereomers, the individual enantiomers and the salts thereof, particularly the physiologically acceptable salts thereof with inorganic or organic acids or bases, medicaments containing these compounds, the use thereof and processes for the preparation thereof.
Enantioselective Strecker and Allylation Reactions with Aldimines Catalyzed by Chiral Oxazaborolidinium Ions
作者:Ki-Tae Kang、Sang Hyun Park、Do Hyun Ryu
DOI:10.1021/acs.orglett.9b02280
日期:2019.9.6
Chiral oxazaborolidiniumion (COBI)-catalyzed enantioselective nucleophilic addition reactions of aldimines using tributyltin cyanide and allyltributylstannane have been developed. Various α-aminonitriles and homoallylic amines were synthesized in high yield (up to 98%) with high to excellent enantioselectivity (up to 99% ee). A rational mechanistic model for the complex of COBI and aldimine is provided
A new and facile route for the synthesis of chiral 1,2-diamines and 2,3-diamino acids
作者:Upender K. Nadir、R. Vijaya Krishna、Anamika Singh
DOI:10.1016/j.tetlet.2004.11.088
日期:2005.1
The synthesis of chiral diamines and diamino acids has been achieved from the corresponding N-arylsulfonyl aziridin-c: through reaction with a chiral isocyanate and subsequent hydrolysis of 2-imidazolidinones. The method appears to be general and of wide applicability. (C) 2004 Elsevier Ltd. All rights reserved.
The First Catalytic Asymmetric Nitro-Mannich-Type Reaction Promoted by a New Heterobimetallic Complex
作者:Ken-ichi Yamada、Simon J. Harwood、Harald Gröger、Masakatsu Shibasaki
The best ratio is 1:1:3 for the components Yb, K, and binaphthol in the new heterobimetallic complex, which efficiently catalyzes an asymmetric nitro-Mannich-type reaction. The desired nitro-Mannich products 2 are obtained with up to 91 % ee starting from N-phosphinoyl imines 1.
Hryhorczuk, Lew Mykola; Bailar Jr., John C., Inorganic Chemistry, 1985, vol. 24, # 21, p. 3367 - 3369