Photochemical Synthesis of 3-Alkynals from 1-Alkynoxy-9,10-anthraquinones
摘要:
Photolysis of 1-(3-alkynoxy)-9,10-anthraquinones in deoxygenated methanol leads to moderate yields (35-45%) of 3-alkynals along with the unexpected formation of diacetals. Reaction of these 3-alkynals with Grignard and Wittig reagents occurs nearly quantitatively without rearrangement to their 2,3-dienal isomers.
3-癸二乙基二羰基二羰基(10)的对映选择性巴豆基硼酸酯为立体化学定义的1,6-烯炔二乙基六羰基复合物(12、13)提供了一条非常便捷的途径,该化合物经历了高度非对映选择性的分子内Pauson-Khand环化成双环辛烯酮14和15(90%) ee 15)。还报道了与母体3-癸醛5相比,烯丙基硼化10中的对映选择性的机械上显着的逆转。