Stereochemical course of the [2,3]-sigmatropic rearrangement of substituted propargyl n,n-dialkylamidosulfoxylates. X-ray molecular structure of [S*, (S)R*]-4-[(1,4,4-trimethyl-1,2-pentadienyl)sulfinyl]-morpholine.
作者:Jean-Bernard Baudin、Itka Bkouche-Waksman、Sylvestre A. Julia、Claudine Pascard、Yuan Wang
DOI:10.1016/s0040-4020(01)86400-0
日期:1991.1
By the reaction with three N,N-dialkylanidosulfenyl chlorides 2 bearing representative sizes for the R group on the nitrogen atom, several substituted secondary propargylic alcohols (la-f) have been converted into the corresponding pairs of diastereoisomeric allenic sulfinamides 3a-n and 3′a-j,l.m. Their ratios have been determined by 1H NMR spectroscopy and were found to depend essentially on the
通过与在氮原子上的R基团具有代表性尺寸的三个N,N-二烷基氨基亚磺酰氯2反应,已将几种取代的仲炔丙醇(Ia-f)转化为相应的非对映异构烯丙亚磺酰胺3a-n和3 'aj,lm。它们的比率已经通过1 H NMR光谱法确定,并且发现其比率基本上取决于起始材料的R 1和R 2基团的大小。一种纯非对映异构体3m的立体化学已通过单晶X射线分析确定。
Hydrogen-Bond-Promoted Friedel–Crafts Reaction of Secondary Propargylic Fluorides: Preparation of 1-Alkyl-1-aryl-2-alkynes
We report that aromatic propargylation is achievable with secondary propargylic fluorides, thus affording 1-alkyl-1-aryl-2-alkynes. In the present case, hydrogen bonding is responsible for the activation of the C–F bond. A large excess of arene nucleophile is shown to be necessary to achieve good yields.