作者:Sanghyeon Lee、Byung-Gyu Kim、Sujeong Geum、Jiheon Kim、Hee-Yoon Lee
DOI:10.1021/acs.orglett.1c01391
日期:2021.6.18
The first totalsynthesis of (±)-jujuyane, a cyclooctanoid natural product, was accomplished from a (5 + 3) dimerization product of oxidopyrylium ylide that forms the cyclooctanoid core structure along with inherited stereochemical bias. Selective functional group modifications of the highly oxygenated dimeric structure, followed by the tactical functional group manipulation around the eight-membered
A three-component [3 + 2]-cycloaddition/elimination cascade for the synthesis of spirooxindole-pyrrolizines
作者:Martina Palomba、Emanuela De Monte、Andrea Mambrini、Luana Bagnoli、Claudio Santi、Francesca Marini
DOI:10.1039/d0ob02321c
日期:——
A three-component synthesis of novel spirooxindole-tetrahydropyrrolizines from secondary α-aminoacids, isatins and vinyl selenones has been disclosed. Products were formed in good yields and high diastereoselectivity by 1,3-dipolarcycloaddition of in situ generated azomethine ylides followed by spontaneous elimination of benzeneseleninic acid. Good regioselectivities with aryl substituted vinyl selenones
Domino Michaelâseleno Pummerer type reaction (additive seleno Pummerer type rearrangement) has been realised by the reaction of 1,3-dicarbonyl compounds with vinyl selenoxides in the presence of amine and chlorosilane.
Alkyl phenyl selenoxides were produced in excellent yields by oxidation of the corresponding selenides with 2-nitro-benzenesulfonyl chloride and potassium superoxide in dry acetonitrile at -15 degrees C. (c) 2005 Elsevier Ltd. All rights reserved.
Vinyl selenides and selenoxides: preparation, conversion to lithium reagents, Diels-Alder reactivity, and some comparisons with sulfur analogs