First total synthesis of neurotrophic diacetylene tetrol (−)-petrosiol D
作者:A. Sathish Reddy、P. Srihari
DOI:10.1016/j.tetlet.2013.09.058
日期:2013.11
The firsttotalsynthesis of the natural product (−)-petrosiol D has been achieved in a linear fashion. Sharpless asymmetric epoxidation, base induced elimination reaction for the formation of chiral propargyl alcohol and Cadiot–Chodkiewicz coupling reaction are the key steps utilized for the synthesis.
The first total synthesis of neurotrophic diacetylenic tetraol, petrosiol A and stereoselective total synthesis of petrosiol E was accomplished. The total synthesis involves Cadiot-Chodkiewicz coupling reaction as the key step for petrosiol A. The diastereorich chiral alcohol (third chiral center) was synthesized from CBS mediated stereoselective ketone reduction reaction for petrosiol E. Of the three
Dichlorination of (Hexadehydro-Diels–Alder Generated) Benzynes and a Protocol for Interrogating the Kinetic Order of Bimolecular Aryne Trapping Reactions
作者:Dawen Niu、Tao Wang、Brian P. Woods、Thomas R. Hoye
DOI:10.1021/ol403258c
日期:2014.1.3
The efficient dichlorination of benzynes prepared by the hexadehydro-Diels-Alder (HDDA) reaction is reported. Cycloisomerization of a triyne substrate in the presence of dilithium tetrachlorocuprate is shown to provide dichlorinated products A by capture of the benzyne intermediate. A general strategy for discerning the kinetic order of an external aryne trapping agent is presented. It merely requires measurement of the competition between bimolecular vs unimolecular trapping events (here, dichlorination vs intramolecular Diels-Alder (IMDA) reaction to give A vs B, respectively) as a function of the concentration of the trapping agent.