Carotenoid Glycosyl Esters Synthesis of β‐D‐Glucosyl 8′‐Apo‐β‐carotene‐8′‐oate and β‐D‐Glucosyl Vitamin‐A‐oate (β‐D‐Glucosyl Retionate)
β‐D‐glucosyl 8′‐apo‐β‐carotene‐8′‐oate (III) and β‐D‐glucosyl vitamin‐A‐oate (VI) were regio‐ and stereoselectively synthesized in high yields from the N‐acylimidazoles I and IV, respectively, or from the N‐acyltriazoles II and V, respectively, and unprotected β‐D‐glucose, according to the method described for the synthesis of di(β‐D‐glucosyl) 8,8′‐diapo‐carotene‐8,8′‐dioate [1]. It seems that this method can generally be applied for the synthesis of β‐D‐glucosyl esters of polyene carboxylic acids.
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