Construction of Spiro-γ-butyrolactone Core via Cascade Photochemical Reaction of 3-Hydroxypyran-4-one Derivatives
作者:Constantine V. Milyutin、Andrey N. Komogortsev、Boris V. Lichitsky、Valeriya G. Melekhina、Mikhail E. Minyaev
DOI:10.1021/acs.orglett.1c01814
日期:2021.7.2
We elaborate a novel one-step photochemical method for the synthesis of spiro-γ-butyrolactone derivatives from 3-hydroxypyran-4-ones. The suggested approach is based on a cascade process including initial photoinduced contraction of 4-pyranone ring followed by intramolecular cyclization leading to the final spiro system. A distinctive feature of the proposed method is intramolecular trapping of unstable
我们阐述了一种新的一步光化学方法,用于从 3-羟基吡喃-4-酮合成螺-γ-丁内酯衍生物。建议的方法基于级联过程,包括 4-吡喃酮环的初始光诱导收缩,然后是导致最终螺环系统的分子内环化。所提出方法的一个显着特点是分子内捕获由于光化学反应而原位形成的不稳定 α-羟基二酮中间体。通过 X 射线衍射确定了两种合成的 1-oxaspiro[4.4]non-8-ene-2,6,7-triones 的结构。