[I:1]/[CH:2]=[CH:3]\[C:4]([OH:6])=O.CCN(C(C)C)C(C)C.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.Cl.[F:41][C:42]1([F:46])[CH2:45][NH:44][CH2:43]1>C(Cl)Cl>[F:41][C:42]1([F:46])[CH2:45][N:44]([C:4](=[O:6])/[CH:3]=[CH:2]\[I:1])[CH2:43]1A solution of (Z)-3-iodoacrylic acid (1a) (2.75 g, 1.0 eq.) in CH2Cl2 (25.0 mL) was cooled to 0° C. and sequentially treated with DIPEA (1.96 g, 1.1 eq), HATU (5.78 g, 1.1 eq) and 3,3-difluoroazetidine hydrochloride (1.98 g, 1.1 eq). The reaction mixture was stirred at 0° C. for 2-3 hr before being filtered, and concentrated under reduced pressure affording 3.5 g of crude compound. Purification by column chromatography (silica gel, elution with EtOAc/hexane) afforded 1.89 g of pure desired compound. Yield (49.87%). Mass: (ES+) 273.8 (M+1).
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