Highly stereoselective synthesis of indanes with four stereogenic centers via sequential Michael reaction and [3+2] cycloaddition
作者:Pei Juan Chua、Bin Tan、Limin Yang、Xiaofei Zeng、Di Zhu、Guofu Zhong
DOI:10.1039/c0cc01577f
日期:——
A highly efficient organocatalytic sequential reaction involving Michaeladdition of bis(phenylsulfonyl)ethylene, in situ condensation and intramolecular nitrone [3+2] cycloaddition with a variety of aldehydes and hydroxyamines to afford a single diastereomer of indanes with four stereogenic centers in excellent yields and stereoselectivities was developed.
A Pd-catalyzed domino carbopalladation/C-H-activation reaction of phenoxyphenyl-substituted propargylic alcohols was used for the synthesis of tetrasubstituted alkenes bearing either a dihydroindene or benzo[7] annulene motif. These compounds are of interest for the construction of molecular switches and motors.
CuCN-Mediated Cascade Cyclization of 4-(2-Bromophenyl)-2-butenoates: A High-Yield Synthesis of Substituted Naphthalene Amino Esters
作者:R. Santhosh Reddy、Pragati K Prasad、Brij Bhushan Ahuja、Arumugam Sudalai
DOI:10.1021/jo400244h
日期:2013.5.17
A new method of CuCN-mediated one-pot cyclization of 4-(2-bromophenyl)-2-butenoates leading to efficient synthesis of substituted naphthalene amino esters including phenanthrene aromatic structural units is described. Deuterium labeling studies establish that this one-pot cascade cyclization proceeds through isomerization of olefin, intramolecular C-C bond cyclization, and aromatization as the key intermediates, all occurring in a single step.