Model Study of the Hoppe Reaction Between Racemic Titanated Crotyl Carbamate and Enantiopure Aldehyde or γ-Lactol

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Abstract
In our strategy for the total synthesis of tylonolide 2, aglycon of tylosin 1, and for the construction of the eastern part C1-C9, we planned to carry out a Hoppe homoaldolisation. In a model study, reaction was performed between racemic titanated crotyl carbamate (±)-3b and optically active aldehydes 6a-c. The expected syn-anti adducts 7a-c were obtained in good isolated yield together with the anti-anti isomer 8a-c. Interestingly, the γ-lactol 6d was also tested and delivered the syn-anti 7d compound in 70% isolated yield.

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