The stereoselective protective group-free synthesis of the C1âC16 fragment of (+)-sorangicin A consisting of a dihydropyran subunit with a chiral alkyl substituent is achieved. The synthesis of the 4-stereogenic centered subunit involved key reactions such as Noyori asymmetric transfer hydrogenation, Achmatowicz oxidative rearrangement, and highly diastereoselective allylation of the Achmatowicz adduct.
                                    实现了由二氢
吡喃亚基和手性烷基取代基组成的索兰菌素A(+)C1-C16片段的立体选择性无保护基合成。4-立体中心亚基的合成涉及Noyori不对称转移氢化、Achmatowicz氧化重排和Achmatowicz加合物的高度非对映选择性烯丙基化等关键反应。