Asymmetric Total Synthesis of Cryptorigidifoliol I
作者:Rodney A. Fernandes、Dashrath Jangid
DOI:10.1021/acs.joc.4c00259
日期:2024.4.5
An efficient asymmetric totalsynthesis of cryptorigidifoliol I based on an unusual Luche reduction leading to bicyclic etherification and acid hydrolysis to a thermodynamically less stable 4-hydroxy-2,6-trans-disubstituted-THP moiety has been achieved. The easy setup of trans-2,6-substitution on the core pyran ring through bicyclic etherification would enable the synthesis of various THP and bicyclic-THP-lactone
基于不寻常的 Luche 还原,导致双环醚化和酸水解成热力学不稳定的 4-羟基-2,6-反式-二取代-THP 部分,已经实现了 Cryptorigidifoliol I 的有效不对称全合成。通过双环醚化在核心吡喃环上轻松设置反式-2,6-取代基,可以合成各种THP和双环-THP-内酯天然产物。
Total Synthesis of Tetraketide and Cryptorigidifoliol I via a Sequential Allylation Strategy
作者:Birakishore Padhi、G. Sudhakar Reddy、Debendra K. Mohapatra
DOI:10.1021/acs.jnatprod.6b00443
日期:2016.11.23
cryptorigidifoliol I (2) has been devised successfully from commercially available starting materials in 11 and 17 steps, with 16% and 11% overall yields, respectively. Highlights of the syntheses involved sequential Lewis acid-catalyzed highly regio- and diastereoselective allylations and intramolecular Mitsunobu lactonization.
Antimalarial 5,6-Dihydro-α-pyrones from <i>Cryptocarya rigidifolia</i>: Related Bicyclic Tetrahydro-α-Pyrones Are Artifacts1
作者:Yixi Liu、L. Harinantenaina Rakotondraibe、Peggy J. Brodie、Jessica D. Wiley、Maria B. Cassera、James S. Miller、F. Ratovoson、Etienne Rakotobe、Vincent E. Rasamison、David G. I. Kingston
DOI:10.1021/acs.jnatprod.5b00187
日期:2015.6.26
Antimalarial bioassay-guided fractionation of an EtOH extract of the root wood of Cryptocarya rigidifolia (Lauraceae) led to the isolation of the five new 5,6-dihydro-α-pyrones cryptorigidifoliols A–E (1–5) and the six bicyclic tetrahydro-α-pyrone derivatives cryptorigidifoliols F–K (6–11). The structure elucidations of all compounds were made on the basis of the interpretation of spectroscopic data