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- W2089652320 abstract "N,N-Diisopropyl 2-alkynyl carbamates 9 are deprotonated by n-butyllithium to form lithium compounds 10. After exchange of the cation, titanium reagents 13 add highly diastereoselective to aldehydes with formation of the title compounds 14. In contrast to metallated 2-alkynyl ethers, the reagents 10 and 13 exhibit high γ-regioselectivity in carbonyl addition reactions, due to the chelating carbamoyl group. The syn-configuration of 14 was deduced from the crystal structure of the urethane derivative 21." @default.
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- W2089652320 date "1987-01-01" @default.
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- W2089652320 title "Highly regio- and syn-diastereoselective synthesis of 4-hydroxy-1,2-alkadienylcarbamates from α-titanatedl 2-alkynylcarbamates and aldehydes1,2" @default.
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- W2089652320 doi "https://doi.org/10.1016/s0040-4020(01)81651-3" @default.
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