Forskolin Editing via Radical Iodo- and Hydroalkylation
作者:Elena Pruteanu、Nicholas D. C. Tappin、Veaceslav Kulciţki、Philippe Renaud、Vladilena Gîrbu、Olga Morarescu、Fabrice Dénès
DOI:10.1055/s-0040-1706003
日期:2021.4
Interestingly, by changing the mode of initiation of the radicalprocess, in situ protection of the forskolin 1,3-diol moiety as a cyclic boronic ester took place during the iodine ATRA process without disruption of the radical chain process. This very mild radical-mediated in situ protection of 1,3-diol is expected to be of interest for a broad range of radical and non-radical transformations. Finally, by using
(+)-13-Epimanoyl oxide has been synthesised in four steps from natural sclareol in an overall yield of 78%; preparation of the related labdane-14,15-diols is involved in this synthetic pathway.
Efficient heterocyclisation by (di)terpene synthases
作者:S. Mafu、K. C. Potter、M. L. Hillwig、S. Schulte、J. Criswell、R. J. Peters
DOI:10.1039/c5cc05754j
日期:——
Ability of (di)terpene synthases to catalyse heterocyclization indicated by the ease that this is accomplished by widely divergent ent-kaurene synthases.
(二萜)合酶催化杂环化的能力是由广泛不同的ent-考鲁烯合酶轻松完成的。
Cerium(IV) Ammonium Nitrate (CAN): A Very Efficient Reagent for the Synthesis of Tertiary Ethers
Treatment of tertiary 1,4- and 1,5-diols with cerium ammonium nitrate at room temperature led to the corresponding tetrahydrofuran and tetrahydropyran derivatives in high yield and stereoselectivity. Utilizing this methodology, manoyl oxide (25a) and a variety of fragrant compounds, such as linalool oxide (8), caparrapi oxide (12), ambrox (14) and other related amber-gris-type odorants have been synthesized; 16 examples are described.
Synthesis of ambergris fragrance chemicals from sclareol, involving palladium catalysed key steps
作者:I.C. Coste-Manière、J.P. Zahra、B. Waegell
DOI:10.1016/0040-4039(88)85323-1
日期:1988.1
Ambraoxide, Ambrox ®, methylambraoxide and ambracetal are synthetised via keystepsinvolving respectively a palladium acetate catalysed elimination and a PdCl2(CH3CN)2 catalysed isomerisation of the mixture of sclareol and episclareol acetates.