Regioselective reductions of 2,3-epoxy acetals with zinc-chlorotrimethylsilane and lithium aluminium hydride: convenient synthesis of 1,2 and 1,3-diones
作者:Yashwant D. Vankar、Narayan C. Chaudhuri、C.Trinadha Rao
DOI:10.1016/s0040-4039(00)95779-4
日期:1987.1
A variety of 2,3-epoxy acetals have been found to undergo regioselective reductions with zinc-chlorotrimethylsilane and lithiumaluminiumhydride to give 2-hydroxy and 3-hydroxy acetals respectively. Their oxidation followed by hydrolysis furnished the corresponding 1,2- and 1,3-diones in good yields.
The Novel Skeletal Rearrangement of Cyclopentanones into Hydroazulenones via a Radical Process and its Application to the Formal Synthesis of Damsinic Acid
rearrangement of cyclopentanones with pentynyl side chains into hydroazulene compounds via a radicalprocess was developed. The presence of a triethylsilyloxy group at the α-position of the cyclopentanone was found to increase the reactivity. Except for this, there was no limitation of the reaction. The reaction was also applied to synthetic studies of damsinic acid, which was isolated from Ambrosia ambrosioides
VANKAR YASHWANT D.; CHAUDHURI NARAYAN C.; RAO C. TRINADHA, TETRAHEDRON LETT., 28,(1987) N 5, 551-554
作者:VANKAR YASHWANT D.、 CHAUDHURI NARAYAN C.、 RAO C. TRINADHA
DOI:——
日期:——
Chiral acetals in organic synthesis: Regioselective synthesis of 2-and 3-hydroxy acetals from 2,3-olefinic acetals. Reinvestigation and further applications
作者:Yashwant D. Vankar、M.Venkatram Reddy、Narayan C. Chaudhuri
DOI:10.1016/s0040-4020(01)85714-8
日期:1994.1
Achiral as well as chiral 2,3-olefinic acetals are converted into 2- and 3- hydroxy acetals via LAH reduction of the corresponding epoxides and via bromohydrins followed by TBTH reductions respectively. Synthesis of 1,3-diones is described. Compounds from chiral systems are further utilized for asymmetric synthesis.
Regioselective reductions of 23-epoxy acetals with lithium aluminum hydride: A reinvestigation.
作者:Helena M.C. Ferraz、Regina M. Sasahara、Pellegrino Losco
DOI:10.1016/s0040-4039(00)74739-3
日期:1992.12
Treatment of 2,3-epoxy acetals with lithiumaluminumhydride gave the corresponding 2-hydroxy acetals, instead of the previously reported 3-hydroxy acetals.