New and convenient synthesis of (R)-(+)-4,5-Dihydro-4-methyl-2(3H)-furanone and (R)-(-)-4-Bromo-3-methyl-1-O-tert-butyldimethyl-silylbutan-1-ol
摘要:
A convenient partial synthesis of the lactone (+)-10 is reported starting from the readily available methyl (S)-(+)-3-hydroxy-2-methylpropanoate (+)-1. Furthermore, an efficient. three step route to the optically active saturated isoprene unit (-)-13 in high yield starting from the lactone (+)-10 is reported for the first time.
New and convenient synthesis of (R)-(+)-4,5-Dihydro-4-methyl-2(3H)-furanone and (R)-(-)-4-Bromo-3-methyl-1-O-tert-butyldimethyl-silylbutan-1-ol
摘要:
A convenient partial synthesis of the lactone (+)-10 is reported starting from the readily available methyl (S)-(+)-3-hydroxy-2-methylpropanoate (+)-1. Furthermore, an efficient. three step route to the optically active saturated isoprene unit (-)-13 in high yield starting from the lactone (+)-10 is reported for the first time.
作者:Claudia M. Schulz、Lutz Lehmann、Rumsaïs Blatrix、Pierre Jaisson、Abraham Hefetz、Wittko Francke
DOI:10.1023/a:1021492204400
日期:——
Extracts of Dufour's gland of the ponerine ant, Gnamptogenys striatula, were analyzed by using the combination of gas chromatography and mass spectrometry. Series of esters of the new homoterpenoids (2E,6)-3,4,7-trimethyl-2,6-octadiene-1-ol (4-methylgeraniol) and (2E,6)-3,4,7-trimethyl-2,6-nonadiene-1-ol (bishomogeraniol) with unbranched medium-chain fatty acids were identified. Transformation of the
Highly stereoselective SE' additions of .alpha.-alkoxy allylstannanes to chiral aldehydes. Synthesis of a C-1-C-9 subunit of tylonolide
作者:James A. Marshall、Dmitry V. Yashunsky
DOI:10.1021/jo00019a003
日期:1991.9
The racemic alpha-alkoxy allylic stannane RS4 adds to the 2S aldehyde 24 to afford the homoaldol adduct 25 (45%) derived exclusively from the S enantiomer S4 along with isomerized (R)-gamma-alkoxy allylstannane 26 of > 80% ee (50%) and unreacted aldehyde (40%). Use of the nonracemic alpha-alkoxy allylstannane 28 (1:1 mixture of diastereomers) in excess leads to the homoaldol adduct 29, which is transformed in two steps to lactol ether 31, an intermediate in Nicolaou's synthesis of O-micinosyl tylonolide.
Naoshima, Yoshinobu; Kamezawa, Makoto; Tachibana, Hojun, Journal of the Chemical Society. Perkin transactions I, 1993, # 5, p. 557 - 562