α-芳基-邻-二甲苯基二溴化物1与硫脲反应,得到单-异硫脲鎓盐2,在某些情况下形成双-异硫脲鎓盐4作为副产物。易与水或醇反应形成3的化合物2在无水丙酮中与Na 2 CO 3环合,生成5-芳基-2,4-苯并噻氮杂5、6和7,但2'-氯苯基衍生物21异常环化成环丁烯20。1-芳基-2,4-苯并硫氮杂卓14、15和16通过酸催化的硫脲13和19的环化反应明确制备了这些化合物。
Nickel-Catalyzed Reactions of Silacyclobutanes with Aldehydes: Ring Opening and Ring Expansion Reaction
摘要:
[GRAPHICS]The nickel-catalyzed ring opening reaction of silacyclobutanes with aldehydes affords the corresponding alkoxyallylsilanes. In contrast, the ring expansion reaction of benzosilacyclobutene with aldehydes occurs under nickel catalysis to give oxasilacyclohexenes.
In a palladium-catalyzed oxidative esterification, hydrosilane can serve as an activator of palladium catalyst with bismuth, thus leading to a novel ligand- and silver-free palladium catalyst system for facile oxidative esterification of a variety of benzylic alcohols in good yields.
Neighboring Lithium-Assisted [1,2]-Wittig Rearrangement: Practical Access to Diarylmethanol-Based 1,4-Diols and Optically Active BINOL Derivatives with Axial and sp3-Central Chirality
synthetically useful diarylmethanol‐based 1,4‐diols and enantiomericallypure BINOL‐derived diols with axial and sp3‐central chirality has been developed through neighboring lithium‐promoted [1,2]‐Wittig rearrangement. The chirality transfer process shows a broad substrate scope in terms of the aromatic ether substituent, which allows access to a broad of range of chiral 1,1′‐binaphthalene‐2‐α‐arylmethanol‐2′‐ols