Selective hydroboration of unconjugated alkynyl ketones and aldehydes
作者:George W Kabalka、Su Yu、Nan-Sheng Li
DOI:10.1016/s0040-4039(97)10004-1
日期:1997.11
Unconjugated alkynyl ketones and aldehydes are selectively hydroborated to give the corresponding olefinic carbonyl compounds after protonation, or dicarbonyl compounds after oxidation. (C) 1997 Elsevier Science Ltd.
Selective hydroboration of alkenes and alkynes in the presence of aldehydes and ketones
作者:George W Kabalka、Su Yu、Nan-Sheng Li
DOI:10.1139/v98-042
日期:1998.6.1
reactions of terminal alkenes in the presence of ketones or aldehydes with a variety of borane reagents have been investigated. It was found that the selective hydroboration of a terminal alkene in the presence of a ketone or an aldehyde is most efficient when dicyclohexylborane is used as the hydroborating agent. The hydroboration of olefinic ketones and olefinic aldehydes with dicyclohexylborane generates
Intramolecular [4+2]-cycloadditions of nitroalkenes with olefins. 2
作者:Scott E. Denmark、Young-Choon Moon、Christopher J. Cramer、Michael S. Dappen、C.B.W. Senanayake
DOI:10.1016/s0040-4020(01)89054-2
日期:1990.1
The intramolecular [4+2]-cycloadditions of di- and trisubstituted nitroalkenes with unactivated olefins are described. The cycloadditions proceed readily at low temperatures in the presence of SnCl4. The reactions are shown to be stereospecific in the preservation of dienophile configuration in the product. The configuration of the heterodiene controls the stereochemistry of the ring fusion but the