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By using your knowledge of Felkin-Anh control, rationalize why compound (21) has an anti stereochemical relationship between C2 and C3. OLI 3 TESO OMe OMe

By using your knowledge of Felkin-Anh control, rationalize why compound (21) has an anti stereochemical relationship between C2 and C3.

OLI 3 TESO OMe OMe LDA TBSO" TBSO" TESO" Tr Tr (18) (19) (20) OTBS recall that LDA is Li .N. TESO H OMe TESO" TBSO Tr OTBS (21)

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