A Convenient Synthesis of Masked β-Ketoaldehydes by the Controlled Addition of Nucleophiles to (Trimethylsilyl)ethynyl Ketones
摘要:
The controlled addition of nucleophiles to (trimethylsilyl)ethynyl ketones provides a facile route to beta-ketoacetals, beta-alkoxy-alpha,beta-unsaturated ketones or vinylogous amides depending on the choice of reaction conditions.
the cases of propargylic ethers, resulting in highly regioselective formation of beta-alkoxy-alpha,beta-unsaturated ketones (up to >50/1 selectivity) via alpha-oxo gold carbene intermediates. Ethers derived from primary propargylicalcohols can be reliably transformed in good yields, and various functional groups are tolerated. With substrates derived from secondary propargylicalcohols, the development