摘要 |
A process for the preparation of a compound of formula (1): is provided, which comprises the reaction a compound of formula (2): with a compound of formula Al(OR)<SUB>3 </SUB>under substantially anhydrous conditions. X, and X<SUP>1 </SUP>are each independently H or a protecting group, B is a base; R is an alkyl, alkoxyalkyl, alkenyl or alkynyl group, each of which may be optionally substituted, and L is a leaving group.
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