A series of polysubstituted pyrimidines were synthesized from in situ generated α,β-unsaturated imines and the corresponding amidine or guanidine derivatives in a convenient one-pot procedure.
Herein is described the development of an intensified continuous flow process for the preparation of a library of alkyl phosphonates through a Michaelis–Arbuzovrearrangement. A careful process optimization and thorough analysis of the competitive reactions led to a very attractive protocol with unprecedented productivities (up to 4.97 kg of material per day) and a low environmental footprint with
本文描述了通过 Michaelis-Arbuzov 重排制备烷基膦酸酯库的强化连续流动工艺的发展。仔细的工艺优化和对竞争反应的彻底分析产生了一个非常有吸引力的方案,具有前所未有的生产力(每天高达 4.97 公斤的材料)和低环境足迹,没有溶剂、添加剂、催化剂和废物。方便地实施在线低场31 P NMR 监测,以实现快速优化和过程监测。还评估了两个关键的烷基膦酸中间体在连续流动条件下对P的 α-氨基膦酸衍生物的前所未有的二氮烯二羧酸介导的亲电胺化苯丙氨酸和丙氨酸,分别是天然氨基酸苯丙氨酸和丙氨酸的生物等排体。
C(sp<sup>3</sup>)–C(sp<sup>3</sup>) coupling of non-activated alkyl-iodides with electron-deficient alkenes <i>via</i> visible-light/silane-mediated alkyl-radical formation
作者:Sanesh Mistry、Roopender Kumar、Andrew Lister、Matthew J. Gaunt
DOI:10.1039/d2sc03516b
日期:——
Here, we present a remarkably mild and general initiation protocol for alkyl-radical generation from non-activated alkyl-iodides. An interaction between a silane and an alkyl iodide is excited by irradiation with visible light to trigger carbon–iodide bond homolysis and form the alkyl radical. We show how this method can be developed into an operationally simple and general Giese addition reaction
Improved rapid setting polymers from bicyclic amide acetals/polyols/polyisocyanates
申请人:Ashland Oil, Inc.
公开号:EP0297154A1
公开(公告)日:1989-01-04
The process for preparing a polyurethane by the reaction of a bicyclic amide acetal, a polyol and a polyisocyanate in the presence of a plasticizer such as dioctyl phthalate and a polyurethane catalyst such as stannous octoate is described.