Abstract
Trimethylsilyl enol ethers are successively converted into chirally protected α-formyl ketones by asymmetric formylation with the 2-methoxy-1,3-oxazolidine 2, transformed into the corresponding, thermodynamically determined (Z)-TMS enol ethers, and then are allowed to condense with aldehydes. All steps proceed with high stereoselectivity. Some synthetic options, arising from the three differentiated oxygen functionalities in the intermediates 8 are illustrated for the title target compounds.
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