Free radical-based annulation of alkenes yielding fused cycloheptanones
作者:Wei Zhang、Ye Hua、Garrett Hoge、Paul Dowd
DOI:10.1016/s0040-4039(00)76687-1
日期:1994.6
Stereospecific annulation of cyclic alkenes for the preparation of cis-fused seven-membered ring systems was accomplished by sequential [2 + 2] cycloaddition, exo-allylation, hydrohalogenation, and free radical ring expansion. The new strategy extends our recently developed cyclobutanone-based ring expansion reactions.
REACTIONS OF α-HETEROATOM-SUBSTITUTED ETHERS AND SULFIDES WITH SILYL ENOL ETHERS. CHEMOSELECTIVITY IN THE CLEAVAGE OF HETEROATOM–CARBON BONDS BY IODOTRIMETHYLSILANE AND TRIMETHYLSILYL TRIFLUOROMETHANESULFONATE
作者:Akira Hosomi、Yasuyuki Sakata、Hideki Sakurai
DOI:10.1246/cl.1983.405
日期:1983.3.5
Reactions of α-heteroatom-substituted ethers and relatedcompounds (R1R2CXY; X, Y = RO, RS and Cl) with silyl enol ethers and ketene silyl acetals took place in the presence of iodotrimethylsilane (Ia) and trimethylsilyl triflate (Ib) as a catalyst and factors influencing the activation of the heteroatom by I were examined.
Stereoselective allylation of dichlorocyclobutanones and sequential ring expansions: Construction of cis-fused cycloheptanones
作者:Zhang Wei、Hua Ye、Steven J. Geib、Garrett Hoge、Paul Dowd
DOI:10.1016/s0040-4020(01)89391-1
日期:1994.1
allyl tributyltin, introduces an exo-oriented side chain on the ring. Sequential hydrohalogenation and free radical ring expansion of cyclobutanones gives, three- carbon, ring-expanded, cis-fused cycloheptanones.