Treatment of the sulfonyl ketones 1a and 1b with potassium t-butoxide in toluene or with potassium hydroxide in toluene/dimethyl sulfoxide affords in high yield the bicyclic dienes 3a and 3b, important precursors for Exaltone® and (±)-muscone. An application of this novel pentannulation sequence is demonstrated for the sulfonyl ketones 6, 10, and 14. An intermolecular variant is exemplified by the
用
甲苯中的
叔丁醇钾或
甲苯/
二甲基亚砜中的
氢氧化钾处理磺酰基酮1a和1b,可高产率获得双环二烯3a和3b,这是Exaltone®和(±)-
麝香酮的重要前体。该新的
戊烯醛化序列的应用已证明可用于磺酰基酮6、10和14。分子间的变体以二烯22的合成为例。