The reactions between diethyl N-(t-butoxycarbonyl)phosphoramidate 1. diisopropyl azodicarboxylate (DIAD), triphenylphosphine (TPP) and primary or secondary alcohols lead to the corresponding diethyl N-alkyl-N-(t-butoxycarbonyl)phosphoramidates 2a-o. Deprotection of crude 2 by refluxing with p-toluenesulfonic acid monohydrate in ethanol affords ammonium tosylates 3a-o in moderate to good overall yields. The N-alkylation of 1 proceeds stereoselectively with complete inversion of the configuration of the alkyl group.
An Optimized Version of Gabriel-Type Nucleophilic Amination
作者:Andrzej Zwierzak
DOI:10.1080/00397910008086868
日期:2000.7
N-Alkylation of primary alkyl bromides with diethyl N-sodio-N-(t-butoxycarbonyl)phosphoramidate 1 carried out in boiling acetonitrile in the presence of 10mol% of tetrabutylammonium bromide as catalyst leads to the corresponding N-alkyl derivatives 2a-1. Deprotection of 2 by refluxing with p-toluenesulfonic acid in ethanol affords ammonium tosylates 3a-1 in reasonable yields.
ZWIERZAK, A.;PILICHOWSKA, S., SYNTHESIS, BRD, 1982, N 11, 922-924
作者:ZWIERZAK, A.、PILICHOWSKA, S.
DOI:——
日期:——
3-SUBSTITUTED VINYLBORONATES AND USES THEREOF
申请人:Srebnik Morris
公开号:US20130079305A1
公开(公告)日:2013-03-28
3-substituted vinylboronates and their use in the treatment of cancer such as colorectal cancer are disclosed. In some embodiments, the 3-substituted vinylboronates have the general Formula I:
with the variables in the formula being as defined in the specification.
Selective <i>N</i>-Alkylation of Diethyl Phosphoramidate: Tetrabutylaminium Bromide as Catalyst for Nucleophilic Substitution in a Homogeneous Medium