合成了一系列的4-烷基或4-苯基取代的2,3-二氢-6 H -1,3-噻嗪-5-羧酸酯,并在甲苯中光解。4-甲基化合物重排为噻唑烷,噻唑烷在溶液中以亚氨基互变异构体形式共存。4-乙基衍生物基本上给出了无环硫代酰胺基-二烯的单一异构体,而4-苄基衍生物给出了所有四种可能的硫代酰胺基-二烯的混合物。4-苯基衍生物产生骨架重排的2,5-二氢-6 H -1,3-噻嗪,其缓慢重排为相应的2,3-二氢-6 H -1,3-噻嗪。
RHODIUM CARBONYL-CATALYZED CROSS-HYDROCARBONYLATION OF ACETYLENES AND ETHYLENE. SYNTHESIS OF α,β-UNSATURATED KETONES
作者:Takaya Mise、Pangbu Hong、Hiroshi Yamazaki
DOI:10.1246/cl.1982.401
日期:1982.3.5
The cross-hydrocarbonylation of acetylenes and ethylene with CO and H2 in the presence of Rh4(CO)12 gave α,β-unsaturated ethyl ketones regio- and stereoselectively.
Novel photochemical rearrangements of dihydro-1,3-thiazines
作者:Shameem H. Bhatia、David M. Buckley、Richard W. McCabe、Anthony Avent、Robert G. Brown、Peter B. Hitchcock
DOI:10.1039/a705331b
日期:——
The 4-methyl compound rearranges to a thiazolidine, which co-exists as an imino-tautomer in solution. The 4-ethyl derivative gives essentially a single isomer of an acyclic thioamido-diene, whilst the 4-benzyl derivative gives a mixture of all four possible thioamido-dienes. The 4-phenyl derivative gave a skeletally rearranged 2,5-dihydro-6H-1,3-thiazine which slowly rearranged to the corresponding
合成了一系列的4-烷基或4-苯基取代的2,3-二氢-6 H -1,3-噻嗪-5-羧酸酯,并在甲苯中光解。4-甲基化合物重排为噻唑烷,噻唑烷在溶液中以亚氨基互变异构体形式共存。4-乙基衍生物基本上给出了无环硫代酰胺基-二烯的单一异构体,而4-苄基衍生物给出了所有四种可能的硫代酰胺基-二烯的混合物。4-苯基衍生物产生骨架重排的2,5-二氢-6 H -1,3-噻嗪,其缓慢重排为相应的2,3-二氢-6 H -1,3-噻嗪。
Stereoconvergent 1,4-Addition Reaction of 5<i>H</i>
-Oxazol-4-ones with <i>E</i>
,<i>Z</i>
Isomeric Mixture of Alkylidene β-Ketoesters Catalyzed by Chiral Guanidines
A 1,4‐addition reaction of 5H‐oxazol‐4‐ones to alkylidene β‐ketoesters, which was catalyzed by using chiral guanidines via a dynamickineticresolution process that involved geometric isomerization of the alkylidene β‐ketoesters, was developed. This method allowed using E,Z isomeric mixture of various acyclic alkylidene β‐ketoesters to obtain the products stereoselectively. The relation between the