Hydrosilylation of alkynes catalyzed by ruthenium carbene complexes
作者:Sarah V. Maifeld、Michael N. Tran、Daesung Lee
DOI:10.1016/j.tetlet.2004.11.025
日期:2005.1
Hydrosilylation of terminal alkynes with a variety of silanes catalyzed by Cl2(PCy3)2RuCHPh (1) affords mainly the Z-isomer via trans addition in excellent yields. The presence of a hydroxyl group in close proximity to the triple bond was observed to exert a strong directing effect, resulting in the highly selective formation of the α-isomer. Intramolecular hydrosilylation of a homopropargylic silyl
Stereocontrolled synthesis of (2S *,3R*,4R*)-4-hydroxy-3-methylproline using a silicon assisted aza-[2,3]-Wittig sigmatropic rearrangement
作者:James C. Anderson、Alice Flaherty
DOI:10.1039/b007586h
日期:——
The first racemic synthesis of the non-proteinogenic amino acid (2S,3R,4R)-4-hydroxy-3-methylproline (1) has been achieved via iodolactonisation of an unnatural amino acid derivative 4. The relative stereochemistry was derived from an efficient silicon assisted aza-[2,3]-Wittig sigmatropic rearrangement of 2.
Regioselective <i>Anti</i>-Silyllithiation of Propargylic Alcohols
作者:Somnath N. Karad、Hayate Saito、Jun Shimokawa、Hideki Yorimitsu
DOI:10.1021/acs.joc.2c01795
日期:——
series of propargylic alkoxides regioselectively in an anti-fashion. Upon treatment with a variety of electrophiles, the trisubstituted alkenyl lithium intermediates were transformed into highly functionalized β-silyl allylic alcohols with high regiocontrol, eventually providing tri- or tetrasubstituted alkenylsilanes stereoselectively. A classic trick for anti-addition with propargylic alkoxides has