Periselective and enantioselective carbonyl–ene reaction of isoprene with fluoroalkyl glyoxylate catalysed by modified binaphthol–titanium complex: asymmetric catalytic synthesis of enantiomerically pure ipsdienol
Enantiomerically pure compound synthesis by asymmetric glyoxylate–ene reaction with vinylic sulfides and selenides catalysed by a chiral titanium complex
作者:Masahiro Terada、Satoru Matsukawa、Koichi Mikami
DOI:10.1039/c39930000327
日期:——
Asymmetriccatalysis of the glyoxylate–ene reaction with vinylic sulfides and selenides by a binaphthol-derivedtitaniumcomplex provides enantiomerically pure (e.p.) diastereoisomers (anti and Z) of β-alkyl-α-hydroxy esters.
Access to Optically Active Ipsdienol from Verbenone
作者:G�nther Ohloff、Wolfgang Giersch
DOI:10.1002/hlca.19770600506
日期:1977.7.13
Verbenone 1 or 2 is converted in three steps to ipsdienol 9 or 10 respectively. The diastereoisomeric 2(10)-pinen-4-ols 6 and 7 (or 5 and 8), wich have identical chirality at the carbon atoms bearing OH groups, afford ipsdienol 10 (or 9 respectively) with the same optical purity as the starting material.
Synthesis of optically active forms of ipsdienol and ipsenol
作者:K. Mori、T. Takigawa、T. Matsuo
DOI:10.1016/s0040-4020(01)93705-6
日期:1979.1
(R)-(-)-Ipsdienol 1″ and its antipode 1' were synthesized from (R)-(+)-glyceraldehyde acetonide and (R)-(+)-malic acid, respectively. This established the S-configuration of the naturally occurring (+)-ipsdienol. A new synthesis of (R)-(+)-ipsenol 2″ and its antipode 2' was also described. Chiral epoxides were shown to be useful intermediates for the synthesis of these chiral alcohols.
The BINOL‐derived chiral phosphoric acid (R)‐TRIP is utilized as an organocatalyst in the asymmetric isoprenylboration reaction of aldehydes, wherein hydrogen‐bond interactions play a key role in the control of enantioselectivity. A wide arrays of enantioenriched dienyl homoallyl alcohols, including two natural products (−)‐Ipsdienol and (−)‐Ipsenol, have been successfully constituted. The synthetic
catalytic asymmetric allylic transfer reactions of achiral aldehydes with 2-ethynyl- and 2-ethenyl-2-propenylstannane promoted by BINOL-TiIV complex with synergetic reagent are achieved for the synthesis of homoenynyl- and dienyl alcohols with high levels of enantioselectivity. The range of enantioselectivity is 84−99% ee with good chemical yields. The application of catalytic asymmetric dienylation