Diastereoselective Synthesis of Bicyclo[3.2.1]octanes via Catalyst‐Free Cascade Michael/Henry Reaction with a Functionalized Vinylogous Nucleophile
作者:Laiyu An、Linghong Chen、Hongzhou Yang、Ling Ye、Hongjun Yang、Xinying Li、Zhigang Zhao、Xuefeng Li
DOI:10.1002/adsc.202300427
日期:2023.9.5
A readily prepared and functionalized vinylogous nucleophile has been explored and utilized to construct bridged bicyclic compounds. The corresponding cascadeMichael/Henry reaction occurred with relatively high reactivity under catalyst-free and mild conditions. A range of structurally distinct bicyclo[3.2.1]octanes were generated in 40–96% isolated yields with excellent diastereoselectivities (≥10:1
Thermal polymerizations and photopolymerizations of 7-alkoxycarbonyl-7-cyano-1,4-benzoquinone methides (methoxy (2a), ethoxy (2b), propoxy (2c), isopropoxy (2d), butoxy (2e), and see-butoxy (2f)) were investigated in the solid state. In the thermal polymerization in the solid state, 2a, 2c, 2d, and 2e polymerized to give glassy solids or a mass of crystals, but both 2b and 2f did not polymerize. In the photopolymerization in the solid state, all monomer crystals except for 2a polymerized to give corresponding polymers as needlelike solids. The needlelike polymer obtained by photopolymerization of highly reactive 2c was amorphous by powder X-ray diffraction measurement. Crystal structure of 2c was determined by single-crystal X-ray structure analysis, and the molecular packing in the crystals was discussed.