Divergent Elementoboration: 1,3-Haloboration versus 1,1-Carboboration of Propargyl Esters.

Divergent Elementoboration: 1,3-Haloboration versus 1,1-Carboboration of Propargyl Esters.
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DOI:
10.1002/chem.201801493
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发表时间:
2018-05-23
期刊:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
--
通讯作者:
Melen RL
Melen RL
中科院分区:
其他
文献类型:
--
作者:
Wilkins LC;Soltani Y;Lawson JR;Slater B;Melen RL

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This work showcases the 1,3‐haloboration reaction of alkynes in which boron and chlorine add to propargyl systems in a proposed sequential oxazoliumborate formation with subsequent ring‐opening and chloride migration. In addition, the functionalization of these propargyl esters with dimethyl groups in the propargylic position leads to stark differences in reactivity whereby a formal 1,1‐carboboration prevails to give the 2,2‐dichloro‐3,4‐dihydrodioxaborinine products as an intramolecular chelate. Density functional theory calculations are used to rationalize the distinct carboboration and haloboration pathways. Significantly, this method represents a metal‐free route to highly functionalized compounds in a single step to give structurally complex products.
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