V. Arnaudinaud et al., Total synthesis of isotopically labelled flavonoids. Part 5: Gram-scale production of C-13-labelled (-)-procyanidin B3, TETRAHEDR L, 42(33), 2001, pp. 5669-5671
Gram amounts of C-13-labelled dimer (-)-procyanidin B3 5 were prepared from
1-[C-13]acetic acid by coupling the optically labelled flavan-3,4-diol (+)
-7 with protected natural catechin (+)-3 in acidic medium. (C) 2001 Elsevie
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