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Synthetic Studies of Javaberine A Based on Intramolecular Hydroamination of Alkenes
Yasutomo Yamamoto1, Hiromi Baba2, Miki Toriyama1
1Faculty of Pharmaceutical Sciences, Doshisha Women's College of Liberal Arts.
Abstract:
A total synthesis of javaberine A was achieved through a lithium amide-mediated intramolecular hydroamination of an N-allyl aminoalkene. The desired hydroamination was accomplished using an excess of i-Pr2NH with a substoichiometric amount of n-BuLi. Using an excess of both n-BuLi and i-Pr2NH led to tandem cyclization, however, resulting in the construction of a tricyclic structure through the formation of one C-N and two C-C bonds in a single operation. Additionally, epimerization of the H8-H14 cis-benzyl tetrahydroisoquinoline to the trans isomer was achieved via β-elimination followed by intramolecular hydroamination.
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