A new and easy route to (2E,4E)-dienals by four-carbon homologation of aldehydes
摘要:
A new synthetic method of (2E,4E)-dienals by four-carbon homologation of aldehydes is described. gamma-trimethylsilyl crotonaldimine 2 , easily generated from N-ter-butyl-crotonaldimine 1, LDA and ClSiMe3, reacts with aldehydes in the presence of catalytic CsF in DMSO at rt --> 100-degrees-C to afford homologous aldehydes 3 in good yields and with excellent (E,E)-selectivities.
Exclusive γ-regio functionalization of crotonaldehyde using γ-trimethylsilyl crotonaldimine. Application to the one pot synthesis of conjugated dienals
作者:Moncef Bellassoued、Malika Salemkour
DOI:10.1016/0040-4020(96)00165-2
日期:1996.3
Cesium fluoride mediated reaction of γ-trimethylsilyl N-tert-butyl crotonaldimine 9 with a wide range of aldehydes takes place in DMSO at room temperature and affords exclusiveγ-regiofunctionalized products. Heating (rt to 100°C) the δ-silyloxy imines 11 thus obtained leads, after very mild hydrolysis of the tert-butylimine function, to the conjugateddienals 14 in good yields and with excellent
3-DESCLADINOSYL-6-O-CARBAMOYL AND 6-O-CARBONOYL MACROLIDE ANTIBACTERIAL AGENTS
申请人:JANSSEN PHARMACEUTICA N.V.
公开号:EP1513856A1
公开(公告)日:2005-03-16
US6825172B2
申请人:——
公开号:US6825172B2
公开(公告)日:2004-11-30
[EN] 3-DESCLADINOSYL-6-O-CARBAMOYL AND 6-O-CARBONOYL MACROLIDE ANTIBACTERIAL AGENTS<br/>[FR] AGENTS ANTIBACTERIENS MACROLIDES 3-DESCLADINOSYL-6-O-CARBAMYLE ET 6-O-CARBONYLE
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2003102010A1
公开(公告)日:2003-12-11
3-Descladinosyl-6-O-carbamoyl and 6-O-carbonoyl macrolide antibacterial agents of the formula: (I) wherein R1, W, R3, R4, R5, R6, X, X', and Z are as described herein and in which the substituents have the meaning indicated in the description. These compounds are useful as antibacterial agents.