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| Diversification of Sulfinamide Moiety and Library Cleavage. With these 10 classes of scaffolds in hand, we next investigated diversification of the tert-butylsulfinamide moieties. We had originally selected this lynchpin in part because of its known acid-lability (40), and were pleased to find that the support-bound sulfinamides could be cleaved with HCl [1 M in dioxane/THF, room temperature (RT)] to afford the corresponding secondary amines without compromising the TBDAS linker (Scheme 2). This result opens the door for additional diversification of this position in the future (N-acylation, N-alkylation, etc.). Alternatively, treatment of the sulfinamides with meta-chloroperbenzoic acid (m-CPBA) (CH2Cl2, 0 ¡ãC) also provided the corresponding tert-butylsulfonamides efficiently. |
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sltmac(½ð±Ò+1): ¸ÐлӦÖú£¬»¶Ó³£À´~ 2011-06-30 08:48:18
lgq101(½ð±Ò+20, ·ÒëEPI+1): 2011-07-01 11:43:39
sltmac(½ð±Ò+1): ¸ÐлӦÖú£¬»¶Ó³£À´~ 2011-06-30 08:48:18
lgq101(½ð±Ò+20, ·ÒëEPI+1): 2011-07-01 11:43:39
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