Dichloromethane → tert-butyl (1S)-1-[4-(2-tert-butyl-1,1-dioxido-3-oxo-2,3-dihydroisothiazol-5-yl)benzyl]-2-hydroxyethylcarbamate

Participants

Role	Name	HCID	Charge
Reactant	Dichloromethane	HCID 6344	—
Reactant	Potassium Carbonate	HCID 11430	—
Reactant	2-Tert-butyl-5-chloro-2,3-dihydro-1lambda6,2-thiazole-1,1,3-trione	HCID 21878638	—
Reactant	tert-butyl {(1R)-2-hydroxy-1-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl]ethyl}carbamate	HCID 86602075	—
Catalyst	Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)	HCID 178418228	—
Solvent	1,4-Dioxane	HCID 31275	—
Product	tert-butyl (1S)-1-[4-(2-tert-butyl-1,1-dioxido-3-oxo-2,3-dihydroisothiazol-5-yl)benzyl]-2-hydroxyethylcarbamate	HCID 58746779	163.5%

Reaction Conditions

Temperature	90 °C

Reaction Steps

Combined 34-A (6.1 g, 61 mmol), 9-A (3.55 g, 15.9 mmol), potassium carbonate (10.0 g, 72.4 mmol), [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (1:1) (2.50 g, 3.06 mmol) in 200 mL dioxane. The reaction was degassed and heated at 90° C. for 48 hours. The crude was extracted with ethyl acetate, washed with water and brine. The combined organic extracts were dried over Na2SO4, filtered and evaporated to give 11.4 g of a dark glass. The crude was chromatographed on a silica column to afford a dark semi-solid (3.3 g, 90%). 1H NMR (500 MHz, CDCl3): δ 7.72 (d, J=8.8 Hz, 2H), 7.38 (d, J=8.8 Hz, 2H), 6.62 (s, 1H), 4.77 (br s, 1H), 3.89 (br s, 1H), 3.69 (m, 1H), 3.58 (m, 1H), 2.93 (d, J=7.2 Hz, 2H) 1.43 (s, 9H), 1.39 (s, 9H).

Provenance & Evidence

DOI	10.6084/m9.figshare.5104873.v1
Patent number	US07141596B2
Source dataset	uspto-grants-2006_11
ORD ID	ord-ac51c16b69c94d40bc327f6d397a29e2
Source note	uspto-grants-2006_11