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With all stereoisomers of pyrans 1 and 2 and ¦Ã-amino acids 3
in hand, we began to investigate methods for the union of these
chiral fragments en route to macrocycles ABC-5 and ACB-5.
Although the efficiency of solid-phase synthesis for the preparation
of large compound libraries has been well documented
(33, 34), polymer-assisted parallel solution-phase synthesis offers
several advantages (35, 36). Benefits include rapid analogue
generation, reduced optimization time, and ease of reaction
monitoring.We thus settled on a parallel solution-phase synthesis
strategy utilizing silica-supported reagents and scavengers.

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