The rateconstants and the activation parameters of the addition of primaryalkylradicals to allyldibutyl-4,7,10-trioxaundecylstannane 1 and (2-ethoxycarbonylprop-2-enyl)dibutyl-4,7,10-trioxaundecylstannane 2 were determined by studying their respective free radical reactions with (2-bromo-1,1-dimethylethyl)benzene and 6-bromohex-1-ene at different temperatures.
Preparation and Carbocupration–Silylation of Allyl Propiolates: Vicinal Functionalization To Form Polysubstituted (E)-Vinylic Silanes
作者:Timothy S. Snowden、Cameron D. Massey、Michael P. Jennings
DOI:10.1055/a-2186-6964
日期:2024.1
The preparation and TMSOTf-mediated catalytic carbocupration–silylation of allylic propiolates has been investigated, expanding on previous syntheses of a variety of β-alkyl- and β-aryl-substituted vinylsilanes from an ethyl propiolate precursor. With few exceptions, the series of synthesized O-allyl (E)-vinylsilanes has been isolated in high yields (61–89%) with exceptional diastereoselectivities
研究了烯丙基丙炔酸酯的制备和 TMSOTf 介导的催化碳铜化-硅烷化反应,扩展了之前从丙炔酸乙酯前体合成各种 β-烷基和 β-芳基取代的乙烯基硅烷的方法。除少数例外,一系列合成的O-烯丙基 ( E )-乙烯基硅烷已以高收率 (61–89%) 分离,并具有优异的非对映选择性 ( E / Z >20:1)。此外,我们还展示了代表性烯丙酯的新型 LDA 引发、TMSCl 介导的爱尔兰-克莱森重排。
Petrow et al., Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1957, p. 1004; engl. Ausg. S. 1035