Asymmetric syntheses of ethyl (S)-(+)-2-methylhept-4-ynoate using both enantiomers of the chiral iron auxiliary [(η5-C5H5)Fe(CO)(PPh3)
作者:Graham J. Bodwell、Stephen G. Davies
DOI:10.1016/s0957-4166(00)86147-9
日期:1991.1
The asymmetric syntheses of ethyl (S)-(+)-2-methylhept-4-ynoate via double alkylations of the homochiral acetate equivalents (R)- and (S)-[(eta-5-C5H5)Fe(CO)(PPh3)COCH3] are described.
Asymmetric Synthesis of the Highly Potent Anti-Metastatic Prostacyclin Analogue Cicaprost and Its Isomer Isocicaprost
intermediate carrying a carbonyl group at C6. Asymmetric syntheses of the bicyclic C6-C14 ethynyl building blocks were carried out starting fromachiral bicyclic C6-C12 ketones by using the chiral lithium amide method. In the course of these syntheses, a new method for the introduction of an ethynyl group at the alpha-position of the carbonyl group of a ketone with formation of the corresponding homopropargylic