Synthesis of 1,3-Diynes via Cadiot–Chodkiewicz Coupling of Volatile, in Situ Generated Bromoalkynes
作者:Phil C. Knutson、Haleigh E. Fredericks、Eric M. Ferreira
DOI:10.1021/acs.orglett.8b02975
日期:2018.11.2
A convenient Cadiot–Chodkiewicz protocol that facilitates the use of low molecular weight alkyne coupling partners is described. The method entails an in situ elimination from a dibromoolefin precursor and immediate subjection to copper-catalyzed conditions, circumventing the hazards of volatile brominated alkynes. The scope of this method is described, and the internal 1,3-diyne products are preliminarily
One-Pot Synthesis and Functionalization of Polyynes via Alkylidene Carbenoids
作者:Rik Tykwinski、Thanh Luu、Yasuhiro Morisaki
DOI:10.1055/s-2007-1000937
日期:——
one-pot, two-step method for the synthesis of diynes and triynes is reported. The reaction of a dibromoolefinic precursor with BuLi effects a Fritsch-Buttenberg-Wiechell rearrangement and generates a lithium acetylide intermediate, which is then trapped with a variety of electrophiles to produce substituted diynes and triynes. Alternatively, transmetalation from the lithium acetylide to give a zinc acetylide
A new procedure for the synthesis of arylor hetaryl-substituted conjugated diynes
作者:S. F. Vasilevskii、M. Fossatelli、A. H. T. M. Kork、L. Brandsma
DOI:10.1007/bf00697082
日期:1993.2
On treatment with two equivalents of NaNH2 in liquid ammonia the enyne sulfides RC=C-CH=CHSEt (cis-isomers, where R is an aryl or a hetaryl) afford sodium salts of 1,3-diynes. The latter react with ethyl bromide to produce disubstituted diynes RC=C-C=CEt in high yields.