Stereoselective PCO/POC-Rearrangement of P–C-Cage Phosphorane in the Reaction of 4,5-Dimethyl-2-(2-oxo-1,2-diphenyl)ethoxy-1,3,2-dioxaphospholane with Hexafluoroacetone

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• 作者：Vladimir F. Mironov ; Mudaris N. Dimukhametov ; Sergey V. Efimov ; Roza M. Aminova ; Farida Kh. Karataeva ; Dmitry B. Krivolapov ; Ekaterina V. Mironova ; Vladimir V. Klochkov
• 刊名：Journal of Organic Chemistry
• 出版年：2016
• 出版时间：July 15, 2016
• 年：2016
• 卷：81
• 期：14
• 页码：5837-5850
• 全文大小：777K
• 年卷期：0
• ISSN：1520-6904

文摘

Interaction of 4,5-dimethyl-2-(2-oxo-1,2-diphenyl)ethoxy-1,3,2-dioxaphospholane, bearing a carboxyl group in the γ-position with respect to the phosphorus atom and obtained from d,l-butanediol, with hexafluoroacetone (CCl₄, −40 °C) leads to the simultaneous formation of regio- and stereoisomeric cage-like phosphoranes with phosphorus–carbon and phosphorus–oxygen bonds with a high stereoselectivity (>95%), whose structure was determined by 1D and 2D NMR spectroscopy and XRD. When stored as a solution in dichloromethane for one month, the PCO-isomer rearranges into the thermodynamically more stable POC-isomer of the cage-like phosphorane. Mild hydrolysis of the PCO/POC-isomers proceeds with a high chemoselectivity and leads to the formation of P(IV)-dioxaphospholane derivatives. Acidic hydrolysis of the POC-isomer leads to the formation of an oxirane derivative with an unexpectedly high stereoselectivity (>95%). DFT calculations (using the PBE functional) allowed us to obtain structures and energies of the initial phospholane, reaction products (PCO/POC-isomers), and an intermediate P(V)-oxaphosphirane.