ALDOL REACTIONS IN POLYPROPIONATE SYNTHESIS: HIGH ?-FACE SELECTIVITY OF ENOL BORINATES FROM α-CHIRAL METHYL AND ETHYL KETONES UNDER SUBSTRATE CONTROL.

Article abstract of DOI:10.1016/S0040-4039(01)93440-9

Use of (c-C6H11)2BCl in the anti-selective aldol reaction of the α-chiral ethylketone 2 leads to high stereoselectivity (>94percent) for the 1,2-anti-2,4-anti isomer 7.The related α-chiral methylketone aldol reaction, 8 <*> 9, proceeds with 84-93percent d