Use of Conjugated Dienones in Cyclialkylations: Total Syntheses of Arucadiol, 1,2-Didehydromiltirone, (±)-Hinokione, (±)-Nimbidiol, Sageone, and Miltirone
摘要:
Functionalized hydrophenanthrenes can be prepared using a cyclialkylation-based strategy. These annulations are highly dependent on the directing effects of the arene substitutents and on conformational considerations. The utility of this methodology was featured in the syntheses of six diterpenoids.
Transmetalation of a functionalized organozinc reagent with 5-10 mol % Me2Cu(CN)Li2 or MeCu(CN)Li leads to a cyanocuprate which selectively transfer the desired ligand in an SN2' sense to allylic epoxides.
The selective opening of α,β,-epoxyketone trimethylsilyl enol ethers by cuprate reagents: selectivity reversal in tetrahydrofuran
作者:Matthew F. Schlecht
DOI:10.1039/c39820001331
日期:——
Lithium dialkylcuprates in tetrahydrofuran give direct opening of α,β,-epoxyketonetrimethylsilylenolethers, in contrast to the allylic opening with cupratesreagents in diethyl ether.
Furans in synthesis. 5. Furan-terminated cationic cyclizations in the preparation of fused, spirocyclic and bridged ring systems. An application to the synthesis of nakafuran 9
作者:Steven P. Tanis、Paul M. Herrinton
DOI:10.1021/jo00221a008
日期:1985.10
The synthesis of quaternary carbon centers through cyclialkylations
作者:George Majetich、Jing Fang
DOI:10.1016/s0040-4039(98)01931-5
日期:1998.11
Treatment of conjugated dienone 1 with at strong Lewis acid at -78 degrees C produced a hydrophenanthrene with a newly created quaternary carbon. During this transformation the arene moiety becomes a dienone system. (C) 1998 Elsevier Science Ltd. All rights reserved.
MARINO, J. P.;JAEN, J. C., J. AMER. CHEM. SOC., 1982, 104, N 11, 3165-3172