5-Pyrrolidin-2-yltetrazole: A New, Catalytic, More Soluble Alternative to ­Proline in an Organocatalytic Asymmetric Mannich-type Reaction

2004 
A Mannich-type addition of ketones to N-PMP protected α-imino ethyl glyoxalate is catalyzed by a new proline analogue, 5-pyrrolidin-2-yltetrazole 1. The new organocatalyst has significant advantage over its parent in that it can be used in non-polar solvents without loss of enantioselectivity.
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