Stereoselective syntheses of alcohols, XXVI. Synthesis of 3‐methyl‐2,6‐dideoxyhexoses by addition of an allenyltitanium reagent to aldehydes

In contrast to the nonregioselective addition of 3‐methoxy‐3‐methylallenyllithium (8) to aldehydes the corresponding titanium reagent 14 produced only propargylic type adducts. The products resulting on addition of 14 to L‐2‐(benzyloxy)propionaldehyde have been converted into 3‐O‐methyl‐3‐methyl‐2,6‐dideoxyhexoses 23 and 25 of arabino and xylo configuration.